Security cameras and systems have come down in price so much, that any SERIOUS grow should have at least one covering it. You can then check yer girls from any internet capable computer. But then, all you'd really get would be an advance notice of the disaster. You'd probably see faces with a decent system. But what good is that other than knowing fer sure exactly who did it.
I would be willing to bet just about anything that you know the person who "ganked" yer shit. You may not know who did it, but it was almost certainly someone you know. 98% guaranteed statistics.
Sit down and ask yourself who knew about the grow. You should be able to narrow it down from there. The odds for it being someone you know are way better than the odds of an "accidental discovery". We just never want to think, believe or admit that one of our "friends" fucked us like that.
Thieves suck ass.